no. 2
The Dirichlet-problem for harmonic maps from the disk into a lorentzian warped product
Annales de l'I.H.P. Analyse non linéaire, Tome 10 (1993) no. 2, pp. 239-252 
@article{AIHPC_1993__10_2_239_0,
     author = {Greco, Carlo},
     title = {The {Dirichlet-problem} for harmonic maps from the disk into a lorentzian warped product},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {239--252},
     year = {1993},
     publisher = {Gauthier-Villars},
     volume = {10},
     number = {2},
     mrnumber = {1220035},
     zbl = {0784.58020},
     language = {en},
     url = {https://www.numdam.org/item/AIHPC_1993__10_2_239_0/}
}
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Greco, Carlo. The Dirichlet-problem for harmonic maps from the disk into a lorentzian warped product. Annales de l'I.H.P. Analyse non linéaire, Tome 10 (1993) no. 2, pp. 239-252. https://www.numdam.org/item/AIHPC_1993__10_2_239_0/

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